Proposal - Investigation and Sampling for Nitrate Source at Organic Resources Facility, Lagoon #4

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Ms. Andrea Alexander September 24, 2020 KERAMIDA Proposal No. P24080R Page 2 Task 1: Preparation of Investigation Work Plan KERAMIDA will prepare an Investigation Work Plan (IWP) outlining the proposed investigation methodology and sampling and analytical protocols to assess the source(s) of nitrate occurring at MW-13 and MW-14 at the Organic Resources Facility. The IWP will include a preliminary Site Map identifying proposed investigation sampling locations. A draft of the IWP and proposed sample locations will be provided to City of South Bend Environmental Services for review prior to submittal. KERAMIDA will contract with Jones Petrie Rafinski (JPR) to survey in the coordinates (eastings, northings and ground elevations) of the proposed investigation sampling locations. The eastings and northings will be utilized to plot the investigation sampling locations on a Site map, the ground surface elevation will be used to calculate the depth to the water table for groundwater sample collection. In addition, KERAMIDA will have JPR establish elevation benchmarks on the adjacent County property if investigation sample locations require f nitrate impacts. Task 2: Field Activities Boring Location Survey KERAMIDA will coordinate boring staking and survey prior to soil boring activities. KERAMIDA will subcontract the boring survey with JPR to determine the State Plane coordinates and ground surface elevations of each of the initial boring locations prior to drilling. Utility Clearance Prior to initiating the subsurface groundwater investigation scope of work, KERAMIDA will call in a public utility locate through the Indiana 811 program. A geophysical survey will also be performed in the work areas using electromagnetic (EM) and ground-penetrating radar (GPR) sensors to identify/clear subgrade utilities or structures. KERAMIDA will retain a qualified subcontractor to perform the geophysical survey and will provide oversight and guidance during the performance of the survey. Groundwater Sample Collection KERAMIDA will advance a groundwater sampling probe to the water table based on the surveyed ground surface elevation and the groundwater elevation based on depth to water measurements from the St. Joseph Aquifer monitoring wells. The sampling probe will be advanced using a Geoprobe® 7822 DT tracked direct push rig. The groundwater sample probe consists of a 3-foot long steel screen housed within a steel casing. The probe is advanced by driving steel rods to the target depth, then pulling up on the rods exposing the screen. The probe will be driven to a depth approximately 5 feet below the water table and the screen deployed. Then water level within the screen will then be measured with an electronic water level meter and the probe pulled up until the top of the screen is at the water table. The probe screen will be developed using a check valve and dedicated tubing to reduce the turbidity to the extent practicable. Once purging is complete, a sample will be drawn for an in- perform a laboratory nitrate analysis. Additional sampling will be performed based on the results of the field test. The laboratory analysis will be used as an independent confirmation of results. analytical data will be obtained t. Field data could indicate that additional sampling is required down- gradient (east) of the proposed investigation locations to delineate the extent of nitrate impact. Task 3: Investigation Report KERAMIDA will prepare a brief report detailing the results of the investigation and recommendations for the installation of additional monitoring wells, if warranted. This report will include probe logs, a search of Indiana Department of Natural resources on-line well log databases, and narrative discussion of procedures and results.